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BlackZzzverrR [31]
3 years ago
5

Please help giving 20 points !!! help me out boys asap

Chemistry
1 answer:
pshichka [43]3 years ago
7 0
Not too sure about the first two but that last are solid and then liquid hope this helps!
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in the reaction H2 + N2 2 NH3, what coefficient should be placed in front of o2 to balance the reaction
Black_prince [1.1K]
In order to balance this equation you need to count each element and how many of the individual elements are in the equation. _H2+N2=2 NH3 You multiply the 2 (Which is the coefficient) by the 3 (which is the subscript) This would equal 6 which indicated there are 6 hydrogen atoms on the right side so the left side should also have 6 hydrogen atoms
The missing coefficient on the left side must multiple the 2 to become 6 hydrogen Answer=3
 

3 0
4 years ago
Summarize Mendeleev and Moseley's contributions to the history of the periodic table.
timofeeve [1]

Answer:  According to Moseley, similar properties recur periodically when elements are arranged according to increasing atomic number. Atomic numbers, NOT weights, determine the factor of chemical properties.

Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a "periodic" way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table

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3 years ago
What part of an atom determines if it will combine or break apart from other substances?
Anni [7]

Electron is the correct answer :D

8 0
4 years ago
Does the solubility of a substance increase as its temperature increases
Rom4ik [11]

Answer:

Not necessarily

Explanation:

In the event of incresing the temprature it is not necessary that the solubility will increase always. Solubility of solids increases but solubility of gases dectreases on increases the temprature.

In solid solubility may remain unchange on increasing the temprature. This happens due to the fact that on increasing the temprature the mobility of substances increases due to thus the solubility increases.

7 0
4 years ago
Why are experiments with incorrect hypotheses also valid?
postnew [5]

Answer:Upon analysis of the results hypothesis can be rejected or modified but you can never be proven to be correct 100% of the time

Explanation:

For example relativity has been tested many times so it is generally excepted as true but there could be an instance which has not been encountered where it is not true

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3 years ago
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